A culture of a certain bacteria doubles every hour. At 9:00 a.m, there were already 120 bacteria. Which
equation represents the number of bacteria, n, at 8:00 a.m? How many bacteria were there? (1 point)
To find the number of bacteria at 8:00 a.m, we need to determine how many times the culture of bacteria doubles in one hour.
Since the culture doubles every hour, from 8:00 a.m to 9:00 a.m is a period of 1 hour. Therefore, if there were 120 bacteria at 9:00 a.m, there would have been half that number of bacteria at 8:00 a.m.
Let n be the number of bacteria at 8:00 a.m.
We can write the equation:
n = 120/2
Simplifying, we find that:
n = 60
Therefore, there were 60 bacteria at 8:00 a.m.